Resideo by Honeywell 45900446-051/B Venturi Manifold 72 kW Reference Load

The Resideo by Honeywell 45900446-051/B is a venturi manifold designed for premix gas burner applications with a reference load capacity of 72 kW. This component is part of the VK41/VK81 series gas control system and serves as a critical element in high-efficiency boiler combustion management.

Key Features:

• 72 kW reference load capacity for medium-duty heating applications
• Gas/air mixing unit engineered for premix burners with up to 20% modulation range
• Compatible with VK41 and VK81 series gas control valves with 1:1 gas/air regulation
• Ensures proper air-to-gas mixture for optimal combustion efficiency in condensing systems
• Designed for use with blower and control gas valve assemblies
• Bulk packaging (B suffix designation)

Application:

This venturi manifold plays a vital role in regulating gas and airflow to maintain a balanced combustion process in high-efficiency boilers and water heaters. It creates a negative pressure at the gas valve connection that enables consistent gas/air ratio control, helping to stabilize the flame, reduce emissions, and protect heat exchanger integrity. The component is commonly used in residential and light commercial heating applications requiring precise fuel-air mixing for condensing boiler systems.

Designed for integration with Resideo/Honeywell combined valve and ignition (CVI) systems, this venturi manifold is compatible with various premix burner configurations. It works in conjunction with variable-speed fans to achieve modulation while maintaining optimal combustion efficiency throughout the operating range.